Dyson Purifier Humidify+Cool PH2 De-NOx purifies and hygienically humidifies the whole room. It also cools you. Hygienically removes 99.9% of bacteria in the water. Removes odors and gases, and continuously destroys formaldehyde. Advanced air purification captures 50% more NO . The fully sealed, 3-stage filter system captures 99.97% of particles as small as 0.3 microns. The whole purifier, not just the filtration system, is fully sealed to Hepa H13 grade. Air Multiplier technology projects over 77 gallons per second of smooth, yet powerful airflow. Connects to the MyDyson app to control and monitor air quality from anywhere, or hands-free with compatible voice services. Gas capture rates vary.²Refers to non-living material. Particle challenge with Dehs oil specified in EN1822 within a chamber specified in Astm F3150.